{pkgs ? import <nixpkgs> {}}: let
  runtimeLibs = with pkgs; [
    wayland
    libxkbcommon
    libGL
    vulkan-loader
    libx11
    libxcursor
    libxrandr
    libxi
  ];
in
  pkgs.mkShell {
    buildInputs =
      [
        pkgs.rustc
        pkgs.cargo
        pkgs.rustfmt
        pkgs.clippy
        pkgs.rust-analyzer
        pkgs.pkg-config
      ]
      ++ runtimeLibs;

    env = {
      LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath runtimeLibs;
    };

    shellHook = ''
      export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath runtimeLibs}:$LD_LIBRARY_PATH"
      echo "[shell.nix] Legacy shell for Rust dev. Use 'nix develop' for full flake support."
    '';
  }